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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c848c7f22e7db81309de6f952a911e60b645004c861f319efcc45047913adec4' 
  AND token = '6RlUb80zkCRAOi7KkxREyvI5Ik9OdOw1FEXD8he/x9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}